Imaging lens apparatus

a technology of imaging lens and lens body, which is applied in the field of imaging lens body, can solve the problems of reduced reflect inability to completely eliminate flare and ghost, and inability to reduce the impact of the lens, so as to reduce ghost and flare formation, improve image quality, and limit the angle of incidence ray and irradiance of reflected ligh

US8665538B2Active Publication Date: 2014-03-04GLORY SCI
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
Publication Date
2014-03-04

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Abstract

An imaging lens apparatus comprises four lenses with refractive power by which lead the light from the object side to the image side: a first lens with a convex object-side surface and positive refractive power, at least one surface of the first lens is aspheric; an aperture stop set next to the first lens; a second lens which is a biconcave lens with negative refractive power, at least one surface of the second lens is aspheric; a third lens which is a positive meniscus lens with a concave object-side surface, both side of the third lens are aspheric; and a fourth lens which is a negative meniscus lens with a convex object-side surface, both side of the fourth lens are aspheric with at least one inflection point; and the imaging lens apparatus satisfy the conditions below: |1 / slope_S8|>0.9; −0.2<SAG_S8<0.1.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention generally relates to a photographing lens apparatus, and more particularly to a photographing lens apparatus having four optical lenses and suitable for small photographing device.

[0003] 2. The Related Art

[0004] With the growth of the consumer electronic markets, the request for photographing module is also increasing. Particularly to the camera equipped in photograph phone, tablet computer and laptop, optical lens almost become the mainstream accessories. However, in order to be installed in the mounting body which itself becomes more and more slim, small and light, the photographing module must be compact accordingly. Besides, image quality and pixels of the optical lens are also important considerations for customers to choose.

[0005] In order to improve the image quality, more and more electronic products use multi-lenses in their photographing module. However, the incident light would reflect on t...

Examples

first embodiment

[0047]Referring to FIG. 3, FIG. 3 shows the In this embodiment, the F number is 2.8, angle of view is more than 69.8 degree, f / BFL is 2.93, f2 / f is −1.8, R3 / f is −3.25, and the radius of curvature, value of air space, refractivity and abbe number are listed below:

[0048]

Radius ofAir Abbe surface #curvaturespaceRefractivitynumberS11.3330.5481.531155.7stop−13.0020.122S3−7.8600.3001.585030.0S42.8700.578S5−2.6740.7561.531155.7S6−0.8890.340S74.9370.3091.531155.7S80.9020.317S9Inf0.1451.517064.1S10Inf0.626

[0049]Furthermore, the aspheric surfaces of the first lens 10 to the fourth lens 50 satisfy the following aspheric equation:

[0050]z=ch21+(1-(1+k)⁢c2⁢h2)+A4⁢h4+A6⁢h6+A8⁢h8+A10⁢h10+A12⁢h12+A14⁢h14+A16⁢h16

[0051]Wherein, c is the curvature of the lens surface, h is the vertical distance between the surface of lens and the optical axis, k is the conic constant, and A4, A6, A8, A10, A12, A14 and A16 are the aspheric constants of the higher order items. Said conic constant and aspheric constants...

second embodiment

[0055]Referring to FIG. 5, FIG. 5 shows the In this embodiment, the F number is 2.8, angle of view is more than 74.6 degree, f / BFL is 2.88, f2 / f is −1.64, R3 / f is −3.15, and the radius of curvature, value of air space, refractivity and abbe number are listed below:

[0056]

Radius ofAir Abbesurface #curvaturespaceRefractivitynumberS11.3020.5561.531155.7stop22.8240.101S3−9.6700.2851.585030.0S44.3400.551S5−2.0810.8111.544156.0S6−0.8030.281S72.6460.3351.531155.7S80.7370.317S9Inf0.1451.51764.1S10Inf0.604

[0057]Furthermore, the aspheric surfaces of the first lens 10 to the fourth lens 50 satisfy the following aspheric equation:

[0058]z=ch21+(1-(1+k)⁢c2⁢h2)+A4⁢h4+A6⁢h6+A8⁢h8+A10⁢h10+A12⁢h12+A14⁢h14+A16⁢h16

[0059]Wherein, c is the curvature of the lens surface, h is the vertical distance between the surface of lens and the optical axis, k is the conic constant, and A4, A6, A8, A10, A12, A14 and A16 are the aspheric constants of the higher order items. Said conic constant and aspheric constants a...

third embodiment

[0063]Referring to FIG. 7, FIG. 7 shows the In this embodiment, the F number is 2.8, angle of view is more than 69.4 degree, f / BFL is 3.16, f2 / f is −1.03, R3 / f is −1.76, and the radius of curvature, value of air space, refractivity and abbe number are listed below:

[0064]

Radius of Air Abbe surface #curvaturespaceRefractivitynumberS11.3840.4921.531155.7stop−8.1400.144S3−6.0040.3191.585030.0S43.2130.589S5−2.9310.7691.531155.7S6−0.9340.300S75.4770.3821.531155.7S80.9100.317S9inf0.1451.5170664.1S10inf0.615

[0065]Furthermore, the aspheric surfaces of the first lens 10 to the fourth lens 50 satisfy the following aspheric equation:

[0066]z=ch21+(1-(1+k)⁢c2⁢h2)+A4⁢h4+A6⁢h6+A8⁢h8+A10⁢h10+A12⁢h12+A14⁢h14+A16⁢h16

[0067]Wherein, c is the curvature of the lens surface, h is the vertical distance between the surface of lens and the optical axis, k is the conic constant, and A4, A6, A8, A10, A12, A14 and A16 are the aspheric constants of the higher order items. Said conic constant and aspheric constan...